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Fixed Assets and UltraTax CS 2023 help is now on Help and Support. We're still moving articles, but you can find most content for the 2023 tax year there. Continue using the Help & How-To Center for tax years 2022 and older.

The State of Illinois has several business rules in place to prevent returns from getting filed with invalid EIN or FEINs. For example, any EIN that is 00-0000000 or 99-9999999 will get rejected. An EIN entered for a grantor trust will also cause a rejection because grantor trusts are ignored for Illinois tax purposes. A grantor trust partner is treated as an individual and is taxed at the individual rate as seen on the K-1-P(3) and the Schedule B. Accordingly, Illinois expects the SSN of the grantor instead. 

Diagnostics will trigger for certain scenarios where an EIN or FEIN is invalid for electronic filing purposes. For more information on valid EIN prefixes, see the following on the IRS.gov website. 

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